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Homework Help: Expression for vertical deflection in a cathode ray tube

  1. Aug 31, 2006 #1
    i need to find the expression for the vertical direction of a beam in a cathode ray tube, using:
    Va - accelerating voltage (between cathode &anode)
    Vd - deflecting voltage
    ly - effective length of deflecting plates
    L - distance from end of plates to the screen
    d - distance between plates
    Me - mass of electron
    e - charge of electron

    this is for a prac of mine so i need to work it out during the prac and show working and everything, but i would like to know what the expression looks like so i have a general idea of what im doing and can see if i get something wrong.

    thanks.
     
  2. jcsd
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